Add DocumentTiming metrics for "time to first text paint"

public/web/WebPerformance.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 67 matching lines @@
     BLINK_EXPORT double responseStart() const;
     BLINK_EXPORT double responseEnd() const;
     BLINK_EXPORT double domLoading() const;
     BLINK_EXPORT double domInteractive() const;
     BLINK_EXPORT double domContentLoadedEventStart() const;
     BLINK_EXPORT double domContentLoadedEventEnd() const;
     BLINK_EXPORT double domComplete() const;
     BLINK_EXPORT double loadEventStart() const;
     BLINK_EXPORT double loadEventEnd() const;
     BLINK_EXPORT double firstLayout() const;
+    BLINK_EXPORT double firstNonBlankText() const;
+    BLINK_EXPORT double firstCustomFontText() const;

[kinuko, 2015/09/14 14:14:33]

Um... some of these are from spec but others are not, for non-spec related ones
could we add comments somewhere, either on Performance or WebPerformance?

Esp. these two would be hard to distinguish without documentation.

[Kunihiko Sakamoto, 2015/09/15 05:11:01]

Added some comments in PerformanceTiming.h.

 
 #if BLINK_IMPLEMENTATION
     WebPerformance(const PassRefPtrWillBeRawPtr<Performance>&);
     WebPerformance& operator=(const PassRefPtrWillBeRawPtr<Performance>&);
 #endif
 
 private:
     WebPrivatePtr<Performance> m_private;
 };
 
 } // namespace blink
 
 #endif